This study reports a simple,rapid and special diagnosis method of carbon agglutination test(CAT)to detect Respiratory Syncytial Virus(RSV).Sixteen specimens of RSV were seen agglu-tination but 8 specimens of other virus were negative.We compared CAT with tissus culture byusing nasopnaryngeal secretions from children with suspected RSV iofection.Of 83 specimens,53(69.88%)were positive by CAT,33(39.75%)were positive by virus culture,There were verysignificant difference in the positive rates beween CAT and culture Blocking test showed thatCAT has high specificity.We believe that CAT has a high sensitivity and specificity and it can beused for the rapid detection of clinical specimens of RSV.